LIBQSIA ,
To get the option “Web”–>”WAR file” , you have to enable the “WTP Extras”.
1) Open Preferences > General > Capabilities and click “Advanced…”. Then expand “MyEclipse Standard Capabilities” and scroll to the bottom and select “WTP Extras” and click apply and close the preferences with OK.
2) Select File > Import… > Web > War file and select the war file. Accept all the defaults and click Finish.
Let us know how this works for you.